Kent Johnson a écrit : > sophie_newbie wrote: > >> Hey Bruno, >> >> I got an invalid syntax error when i tried using your "str_counts = >> dict((s, str_list.count(s) for s in set(str_list))" bit of code? Maybe >> there is a missing bracket or comma? Or maybe I need to import >> something. > > > It should be > str_counts = dict((s, str_list.count(s)) for s in set(str_list))
Of course, my bad :( > or for Python < 2.4 from sets import Set as set > str_counts = dict([(s, str_list.count(s)) for s in set(str_list)]) > > Note that this solution iterates str_list once for each element of > str_list once for each *distinct* element or str_list (it iterates over the set created from str_list). > - the call to count traverses the entire list to create the > count. I expect Paul Rubin's solution will be dramatically faster for > large lists as it only iterates str_list once. Yeps. But I would benchmark it before choosing one or the other solution. -- http://mail.python.org/mailman/listinfo/python-list
